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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6143bd307acc2173c72c97a95199f57e5498cc568ec6d86e4cec03347322e6' 
  AND token = '7KyAl19dcPg9zIBo7/bryUdbZDb2p2GZS4u7X92BMn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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