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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '945137cc2f0d4c75506d59ba5870559ab5b4a9a52f33e3c3d023d9fd9abf2edb' 
  AND token = 'Be6Hi0L/iV6Tg9nq6tL5vM8amqbGn16HSjgYlhk5bJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00120

JSON explain

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