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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6fcb50cfdd8f9df3c3fcb0325a0492e295fac59f55c661c3ec405ba64eb0884' 
  AND token = 'XKB/3wimkf4uHthJPba3fo40PuKxYYJKV7PeZgypjHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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