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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561ee7171483a522659398698907a31b1f41c743a8ef93ca11856de2702cc7d2' 
  AND token = 'xJ0Exgze/K6p116P0gpZ7OJ3EGeKx0JFhgJmdPPp3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}