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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfd12e00d08bbe7cbee5daebff5efeffe28f5dca4d8e4bb146c6a5cb1758a98' 
  AND token = 'lB14yCSAK8cGyH/PaNRVu8JqJ7iueUoKj2d0tjrSCRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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