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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe042654e8acb18d5981062442d239edd52b77af7a3f6bb3db8f3ba6afcfb5c7' 
  AND token = '4clwRL4VbIhPR6qD2UewNqIcOk7shZZJx4wGFcSSp30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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