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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd430380e677718bf4477883282a6444dfcd4943e74dea52b26e6972b28fc6fa' 
  AND token = 'Fh3MtHiLP4sQr8Cv4oXe3/rwQ0UNs40fHIh8WFNFifE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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