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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34f32915e2f04f94771d1a93e8d5fe7cd072d8fcefa8f8cd7a2d008939af61' 
  AND token = 'qzcHSZ6zYbNbYsFtBn8PnBB3WsKmK0nv66PqlL06KMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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