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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96886aec6fdfb091a8cad8964877f2b234cb131cf803cd66eb7b9fd7d2bacc53' 
  AND token = 'zQu7YfH4usxoeL3gdoB8P9raOg4RZophDbiX/pfeWvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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