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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f8f5b095a19fe9f792d9f7a943a31ea793cd762a78a2db0a15fc43a104c52b' 
  AND token = 'TgS3eGdc2QW22Yj/MSry0BV5XGnyCCXapYTHYoHYf/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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