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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb6e97d586586facafaaed12f7a3ec156480685bb9b77e37d072d85655904f9a' 
  AND token = 'RX0n0g7yUi960n96kxZrfqeq61VOdCu2JZZo4tmwQE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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