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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa3c0fb3bcefe6b62ff328db462f4367d8b9d2b16b473ba2b181922b733dec4' 
  AND token = '9il4ouRO7Xs73yWl6icKM5giO/ok0xo3oYoHykTTRwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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