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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d548343d5c65261d8b9766cb572feaf9f03f3d4994270354b124387aec81b7' 
  AND token = 'll26AqCfcbltR1IlMbJr1FuWW7ykF1X+fSo95lUcXGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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