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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2514d6efd7f74bf281b0dec739a21e59138246d28bf26f4dbcf4f1b6def7985b' 
  AND token = '3xTEL4iQeVLxD86D6KO4wUxc18BGlKxL8l79kuwq4Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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