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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f130cab5a19db875efb0491f85c84680efa38bf116c71cb1fcdc9506f6afe8' 
  AND token = 'TuvnKLVF5JDwReFOQXPG5wCkLRXONbiqD4Sy0V32+bE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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