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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ec306ac2d075c8bb814cfa4e8dc3bc6d828ae1991e56cbf026cb9bc377a881' 
  AND token = 'mlPlViJHBfYj3i26mhoOG5iIN5h30pBzR1Dxl3ZQsnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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