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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0caadfa2f3dda928800205afc4f6e071d7240b6b20b1cffece1fb9ce2e30adb0' 
  AND token = '28uyz1hTCVsi4G9l8RQ5D8xbSLaxNE4Dw8hf5EPbroM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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