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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ceb1bcca453e6a1095b05ad9af2d3de7e1a5b28d415fbd6bb7c2fc339fc970db' 
  AND token = 'RH3ufA53uNFN4XWRTeuQQ70nTOq0cPI3VfrbebjNpeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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