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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f232de5b8220da08cff59988d84b227a1a406f1ed3b3632217c6e78b42044344' 
  AND token = 'D6MVjfhi3Y3jc5aM142iYCVd6PseidsaC3luQ4XVmuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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