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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cdc4a247fcb50d9833e61fc92387c07cd10c6bb6f7d8b85be0aa84dabc7130d' 
  AND token = 'FB6b8ckWa0ujkT4PD0uCGF6iIj8CtTkpC78SFF7bmOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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