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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00841d8a07907ef14954fa690187e21f4dad08aaa876ae1149e9bba6ec90478b' 
  AND token = 'fv7vuUAq00r/CU4hRc9c9+EvrvkeINuilq2p28qB5tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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