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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9854a66664a3b510ea1c897edbc8c2bf4f22dcc1120f224cdbeed5b24c40d6e4' 
  AND token = '3G+sKfbKKRHbYjaYfTot59rLCtLC2r6WzQuiGInwhSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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