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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a7fa6ae191f83cbdeb0ed1419d3f7128e06583a47d5776603701f21a9acdd2' 
  AND token = 'zo4kpmz9IRQ4NNR7JSg2rz9Xv92hcXy07wZmGppiNWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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