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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1909a281a586730062b7600fa42a9e1ce87d42e9afa911bb5adb27d9f23d191a' 
  AND token = 'vxu7J+dxr5lResyb0DG7QCBO5eCXqnBTLxZgFSTiZnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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