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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88d7b47d477b606b7cdc051b14ab91cf98da48bdaf963ce09b229cd4cb8a540' 
  AND token = 'VNm/6nuw4FE18+XvhMXEOuzFZV8zJblGp4c63eso+5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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