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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04fdc2f5ebff36e9ef486616ec1a4a60b10a28146b206498a836c048f4daa6a' 
  AND token = '0nkjYZi7pYuqUFHVG5RyzJH9UfzcHCiahzpn42BhZpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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