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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e99eee71a6cddcdfbd491b1d92ae7b3852b966433eee628d2ac7a12d37d153' 
  AND token = 'ERXA99mk0lYDyB5IQOhr2ibhzNDHpj3PuqwqMN6juZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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