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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7629c65f55d767ba79e7142942403a003a095fb14185b6b5bedd12110c65b09e' 
  AND token = 'IxRtR7uGhLEaKNnYqSPlWrlOtv69uMiDOS458zkCzfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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