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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2006a897f848da24e1ec8c59e46edcae9c87f75d7b8b7443220eaa03cb074ff4' 
  AND token = 'p3ubRQP2Y88glDH/dJ/LVIC/m1ViKLo3HA9SgGn4B34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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