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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe02adf9699d92075008fd0b4f804538e346661b43e95e2d577d896c3c9563db' 
  AND token = 'VABHtollSEnC8F2h4aqXfAv7YyamJTXtGw7Ut0MgDl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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