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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '255df9bd89c122a6a4898afe4470e2648c0cf4008be23b8571746ef78e3cbb19' 
  AND token = '/bEioFCdX0MtWtwE8EUnyO6KLH2iWiiWXAIdVXwKTzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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