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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b011b5d2e682599650fe662f0470056b567311bd924760e63fee767642c454d1' 
  AND token = '7UWOpigyuFDSY3xoFjdU++ZbzSQQQUw7qNLlP/wD0ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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