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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98e687ee61419ed15d526c81f16354b6511bfe8ae1cee13a4bd373f5068a37fa' 
  AND token = 'KxW/Hv/1L7TNLEvBtAFFPQNQ363ekmu3RpSQUXbFiJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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