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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcba76c1ad0064fdc436b975ce77206e43e706d67332cac1a155a027dc723166' 
  AND token = 'ZuLtzTSDzLwPGk4KdRT35Ew0/oc3JkzVKuljw72C0Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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