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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938fdebf265f9f75bda9a0c2137e3ed2bf0bb2ce1e6abb734e7a2dc3ea3925d6' 
  AND token = '5zBT9ZVSDkX+BPYnyJ8DYnfUkSVAfJ0heIZidSia/rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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