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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ad18dc156d5b06d71e01d682dcef6c86cfd9b3aa7b0ed618a324adb1fb2748' 
  AND token = 'N4llNWkyulfBZelql3Nu/5H2h/+GJlVEG6y/KgT16uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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