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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7998849b2621845ffece43d30306c6f518d5e5edf22ce6ad0a9621b126e6b6' 
  AND token = '8C841Yerse7AhwmhxbhKKdk7IxWQkjgJnQMgIDWk/8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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