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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40caf5f92dee78ca5d85c3d02bfa83d6fdc0c25a896008d787d51a499fd575e5' 
  AND token = '2ChkBTmokv6JwDaczK304fZjlkf1jJoXfUyeolXmXM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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