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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fa956b384ee83bf9f3ef393983b85cdc9ea3cb43b8a4d228b36fd72a437a19' 
  AND token = 'N6Sy5lYUbTchrrQLurt5BgavHIHx62u1K8swdlHgwpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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