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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd68c0e53a64b2423406c9e7de6ce968fc0de1969fe88b024fa4740913de43d' 
  AND token = 'WaeP2wDMkQNOrsqSZL7YT6mj7gGyKT3uKxBmJ2rH6gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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