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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e972357b773184f0b468e32b99a7da394db153dd4692126d95dcfde03b03f0f' 
  AND token = 'wdi+Dc3Q5gkxNSdeKmKdTmJw+Cu86k6QVe6Q+y9pqnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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