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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa76adbd4e5a13ce8dbd396f3f402c0737787b2a16543bb009d687e7af3232af' 
  AND token = 'hGfOdh/0cMtvYLfKAdDnXoDo4zheauBTmmCxRL6QxNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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