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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ff565f7b3a5af7007678ff9b8045028b5d5c4891e2c7db78432809aba72d7c2' 
  AND token = 'SXdL+ZAErjyws2Kog1QVIjATmiDuxD00H3TkKck4le0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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