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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9d748926cef424bacc46854f8ebf0dcf0460f8f638af5cc7d5e7a06d457d39' 
  AND token = '4dnu76VG/AC6mmjrAzaogkumzoYz5qj9TisbnvF++Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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