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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92d8c923301350931bbb7a1f285eda6289d83cf6da9fe9e9a8451e94aea848a' 
  AND token = '57OId7oRa+n/JZ+sE2339SHq2sxhTHNCkfAYrB/rAms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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