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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ba694519270e0c6bacde4ff44b57b59fec0da3c61ecd409d516b44de106ff2' 
  AND token = 'oTHWudqB5u+QB7VkWB1aIq6eJyb4XaKBwM3HMumPxQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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