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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6592dab87c3fd6a1662e063e1f664d12cf43c13bd3871e3b92b003d43ee55c9' 
  AND token = 'HulYK7J7vLggC+3wktYRtcENOKanP9O33kWdn8eXl9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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