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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e720de27969700a73cf2ecfc756aa8b830ef1b2a954f571919679ce901638e51' 
  AND token = 'W1ej3BZJv32ekIzRKgfNJ8bf5zDMqG59MksugE+8WfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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