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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5baea61f39ca6b5a50e00b7529707d0070e8288d8e028217c8c4290a99985c23' 
  AND token = 'ZwlYXiUi5pyXCzxo1A1EbYDm2XMqTgwK6xqEuo+iVk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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