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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b24b0c3bafb2b6c9c7f651d16c614d5a1d90fff492cb3724e08b818edf75f6bc' 
  AND token = '35IegfLos0y7l9eXjQCf6ni6pPYS4rfBBK/b9dwKTEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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