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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24085a0756c287cbc09640a4bd57d470c782db8c9cd37b50be98284b20d1b6e3' 
  AND token = 'gnJk8gF9K4eYWLsxu65Zih1hYZ6BQ3+mQTmNUpqFMr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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