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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611908cd9706d80e427be99aac8bf3d12668acf3f8f334a6ed820179721ef574' 
  AND token = '41yIx3X1HoLIKPfUThtyhh5a3amo+9k9Vbr7d435FD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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