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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dcd01b73e8c01090a2ffb62d4b2787ac406151925e23d771adcd8c19422b91c' 
  AND token = 'bkdFOPhzVuJAvEzHRj5RY3EU9zIOcv5ix6jsxwfd8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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