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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4e8ae88b484b4ae650d07b9e1062af4322f1687f5b265f56cc7b368e6d873e' 
  AND token = 'CFxqp7ftSyoCKEJo6DeolhflUE9bDR9yOHyn5UogPek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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