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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7946be852ff0d845186c5ce4f289ccd41a596b3f632d96e7ee74f5a9561c71e6' 
  AND token = 'bjseDWAzFWlH07ZW2Hlv0dr8xgybOjw9ewG94ukn3xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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