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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833cb336a0c5b7c611af281809b06af81b6abfb5b38edf71a4b503ea8c3c80c3' 
  AND token = 'PknmCOarmO3pnCeuoXG+wKUKtQe0KQ4qJTuZyj2iU/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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