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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c3515779df4524418b6b5f9403729357a037ebb34215b6ae149e391d14e8761' 
  AND token = 'FJyIelHZaNO9gZTyXI8q7Rxk0niKepX4snru/VX89Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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