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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4149356fede9ba0154d249b4adf3c8dc438ec95dc7da821e9eee7b438277a51' 
  AND token = '740Rg6R+/uJNLcKqi8GIieT1Ovt36kOKB8WNqf1xutE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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