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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc0254333b01135d7a209e41e98a9fafa5d60cbfa5a728942e2080f4432a4fe' 
  AND token = '4sGEP1yHvKwol8ssJ7w4UuwZTBAPRtR+o12mHLy6T6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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