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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe907394af55423a5b91f67ea65bff1974325ee38a01c67bf52acc49ad235d6' 
  AND token = 'W2jfsy2FgQYOxe9GvFLUBl6P9e8M4dN9TzX8eVC4jB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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