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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d003676bc41a8c999d33fe843635a399adb635d383a11d619fcd30cbb5bacc' 
  AND token = 'zA3Dq+tsOGsj1PV8SCmjJyUBKrRyJWlQ/tPhS0GNMhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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