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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f94253a391488eb1b3fbba16f5c411d8ee0dde1e8c21352657dc1d79452d9f4' 
  AND token = '9mH4sRdM274Jj7NlChJrQaD7YOdQyyoExRQvLN9rUUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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