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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76f31964590f19b46acb099aa16d5bb6d5a1661ed61f336ffb4dc12ab6a9f8c2' 
  AND token = '2uEGgx+waNujiunlfiU7vnPFvOdsjeSPJAEBDx+FoYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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