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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dca718417e29301f12213e7ce50763faa3c7f13591e057028aa7a7d124fcfc' 
  AND token = '3Mj7fZZjGBALjESPYmjsWbPc1fCrWvgzlDZX0P3TG5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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