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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d6fcc149ab79ea3d6be880784a29817664c8ccd05fe3f5d28ee34954024668' 
  AND token = '/gkMfqlcG/dyQHHqg65qdGgusnS/vjD5raY6u8/rsn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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