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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7048c5c3fc996c129ae07a9055060c6e9c8949546efc96ba6b67a63704f80ce' 
  AND token = 'Si57d0gboJ9wOjKydTcCxo55vSjsEUJbDbUTmq+EtdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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