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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e97ad0b035e9fbbfd0f4eb46bf45276ce16047afc99c6f2a513b5e02ad96e87' 
  AND token = 'ox3PUmlKNA8V8XLnGQH9jco5tPT0hwJLjcUNEB3L38g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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